
Spoilers…
I was wondering what his brother would gain by messing with their relationship, since Seo An has already stated that he isn’t looking to get in his way at the company. I guess he’s threatened by how much better Seo An’s mental health has gotten since being in a relationship, and he probably wants to cause issues with them in order to throw him off at work? That’s the only reason I can come up with, tbh. He views a mentally healthy Seo An as a threat to his position.
As for the new guy, I don’t even care about that, tbh. They’re so in love that an old love interest is just boring, unnecessary drama. Hope we don’t get any cliché misunderstanding bs.